Self-igniting incandescent lamp.



No. 677,326. Patented June 25, l90l. A. BAMMUSER.

SELF IGNITING INCANDESGENT LAMP.

(Application fllud July 5, 1900.)

(No Model.)

Wi in! In:

m-urno WASHINGTON u c UNITED STATES PATENT OFFICE.

ALBERT RAMMOSER, OF BERLIN, GERMANY.

SELF-IGNITING INCANDESCENT LAM P.

SEEGIFICATION forming part of Letters Patent No. 677,326, dated June 25,1901. Application filed July 5, 1900. Serial No. 22,611. (No model.)

To all whom it may concern.-

Be it known that I, ALBERT RAMMOSER, a subject of the Emperor ofGermany, residing at Berlin, Germany, have invented certain new anduseful Improvements in Self-Ignitin g Incandescent Lamps; and I dohereby declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to whichit appertains to make and use the same.

This invention relates to self-igniting incandescent lamps, and has forits object to produce a lamp of this class in which certain objectionsto such lamps as heretofore made are overcome. In a certain class ofsuch lamps if the lamp were continuously burned for any considerablelength of time a regular conduction of the heat from the primingcomposition in the interior of the mixing-tube to the primers situatedabove the tube could not be effected, but the primers would be expandedinto contact with the surrounding metal parts and would sometimes fuseor melt with these parts into an integral mass, thus ruining thestructure. To cover these primers with asbestos or other non-conductorsof heat has proved insufficient to remove this difficulty, as has alsothe inclosure of such primers in pipes. With the lastnamed expedient theheating of the wires to incandescence was so retarded as to render thedevice practically useless on account of the waste. My invention isintended to overcome all of these difficulties; and the inventionconsists in the improved construction, arrangement, and combination ofparts hereinafter fully described and afterward specifcally claimed.

In the accompanying drawings, Figure 1 is a view of the parallelvertical loops of plati num wire used in my lamp. Fig. 2 is a view ofthe loops wrapped with a platinum wire in spiral form. Fig. 3 is a Viewof the structure of Fig." 2 with the priming composition securedthereto. Fig. iis a view of the structure of Fig. 3 wrapped with severallayers of spun cotton. Fig. 5 is a vertical sectional view of a lampwith the completed igniter attached. Fig. 6 is a similar view on a planeat right angles to that of Fig. 5.

In carrying out the invention one or several loops of small platinumwire are formed, as at a, care being taken that the single wire shalllie in straight lines in parallel positions for the reason that then allof the wires will be heated to incandescence throughout their wholeextent. These wires are next wrapped in a platinum-wire coil, as at binFig. 2, from the bottom upward through a portion of their length, and onthese wrapped wires is secured the priming composition, as at c in Fig.3. Instead of the platinum coil 12 a small tube of platinum might beused.

A thin fabric is formed of cotton mixed with a small portion of asbestosand first impregnated with a solution of salt of thorium or cerite andafterward impregnated with a solution of a salt of platinum and thendried. The structure of Fig. 3 is now wound with this fabric in layers,as at d of in Fig. 4, and the igniter so complete is placed in the lampin lines parallel with the gas flow, as shown in Figs. 5 and 6, so thatthe several parts of the igniter are in contact'with the gas flow forits entire length. This raw primer is now burned by a spirit-flame untilits cover is reduced to ashes, whereby is left a porous andheat-resisting skeleton, which not only permits of the passage of theflowing gas, but is also an isolator for preventing the transmission ofthe heat of the incandescent wires to the adjoining metal parts. Thisisolation can be improved by coating the parts adjacent to theincandescent wires with a solution of platinum.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

A self-igniting burner comprising parallel wires, an inclosing wrapperof platinum wire, and an outer wrapper of several layers of textilefabric impregnated with a solution of the salts of thorium or cerite andwith a solution of salts of platinum, substantially as described.

In testimony that I claim the foregoing as my invention I have signed myname in pres ence of two subscribing witnesses.

ALBERT RAMMOSER.

